To mark it, the former premier took to his social media to share photographs of him and his wife sharing a private moment at an undisclosed waterfront location.
So romantic kan!
A beautiful relationship
“I am shy of showing public affection. But we have been married 64 years.
“I think it is worth celebrating our tolerance for each other and other feelings,” Dr Mahathir said, as reported by Malay Mail.
Later, Dr Mahathir added another video on Instagram, captioning it "64 and still going strong #LoveStory".
Dr Mahathir and Dr Siti Hasmah got married on 5 August 1956.
They met while they were studying at the college that eventually became the National University of Singapore.